Can I use a usb wifi card on my MacBook Pro?

I'm having trouble connecting to my old router (d-link di-714p+). The matter has been discussed here in other threads and it seems that no one can connect a MBP to this old router.
I don't want to buy a new router, yet, and running a long cable throughout the house is sturting to bother me.
I also have a dwl-g122 wifi usb dongle and I thought this might be an solution: I'll stick the dongle into my MBP and have wifi...
BUT: Does anyone know if connecting 2 wifi cards to a mac can damage it in anyway? Can I temporary disable the AP card ? How?

If you have a driver for the USB stick then yes it will work, however do a search in the forums for the USB stick you have and you will see that some people have had problems.
It won't physically hurt your Mac to have two wireless adapters, though for simplicity sake you may want to remove Airport from the list of possible network connections in
System Preferences > Network > Configurations
iFelix

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Didn't try turning off the firewall, but if it requires that I would not want to use it anyway.
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